APK MOD INFO
Name of Game: Kill Devils
VERSION: 1.81

Name of the cheat, mod, or hack (credits: wendgames):
-Unlimited Gold and Diamonds

Kill Devils MOD APK 1.81 (Unlimited Gold and Diamonds)

Download the CACHE file/OBB file. They should be .zip or .rar files.
Extract the file to your sdcard.
Move the extracted folder to the location: /sdcard/Android/obb